Eaton HKD3125 - 125 A, 600 V, 3-Pole Circuit Breaker | AmpState

Introducing the Eaton HKD3125 — a 125 A, 600 V, 3‑pole molded case circuit breaker engineered to deliver dependable branch circuit overcurrent and short‑circuit protection in panelboards and loadcenters. Built with a compact profile, it helps you maximize valuable panel space without sacrificing protection or performance.

The thermal‑magnetic trip unit provides stable, repeatable protection across a range of operating conditions. That means fewer nuisance trips and reliable response to both overloads and short circuits, so sensitive equipment and wiring stay safeguarded over the long term.

Why the HKD3125 stands out

• Compact molded‑case design minimizes panel depth and frees up space for easier wiring and future expansion.
• Thermal‑magnetic trip delivers predictable protection, balancing fast response to short circuits with consistent overload protection.
• 3‑pole configuration ensures simultaneous disconnection of all poles for balanced protection and safer de‑energization in faults.
• 125 A rating supports larger branch circuits, reducing the need for multiple smaller breakers and simplifying panel planning.
• 600 V rating makes it suitable for a broad range of commercial and light industrial applications, including multi‑load panels and distributed systems.
• OEM‑level compatibility is designed to work with matching Eaton OEM loadcenters and panelboards, easing replacement and maintenance.
• Trusted performance from Eaton, a name synonymous with reliable electrical protection in panels and enclosures.

Ideal use cases

• Residential distribution panels that require robust overcurrent protection for high‑demand circuits.
• Commercial network panels and service equipment where space management and dependable protection are priorities.
• Light industrial control panels and equipment enclosures needing a durable, high‑amperage, 3‑pole breaker.
• Retrofit or replacement projects where OEM compatibility simplifies upgrades and reduces downtime.

Practical details and tips

• Use in applications demanding reliable branch circuit protection and quick disconnection during fault conditions.
• Verify compatibility with your specific OEM loadcenter or panelboard to ensure full interoperability and uninterrupted protection.
• When replacing an existing unit, check the amperage rating, voltage rating, and pole configuration (125 A, 600 V, 3‑pole) to match the HKD3125 specifications.
• Follow all standard electrical safety practices during installation, including de‑energizing the panel and using proper personal protective equipment.

Technical specifications at a glance

• Manufacturer: Eaton
• Part Number: HKD3125
• Type: Thermal‑magnetic molded case circuit breaker
• Amperage Rating: 125 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short‑circuit protection in panelboards and loadcenters